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comparison jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterSaveLayout.java @ 22672:1bbd4a7c274b

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Rename jdk.internal.jvmci to jdk.vm.ci
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 08 Oct 2015 17:28:41 -0700
parents jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/RegisterSaveLayout.java@ec96f33a101d
children 9e1235406b59
comparison
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22671:97f30e4d0e95 22672:1bbd4a7c274b
1 /*
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package jdk.vm.ci.code;
24
25 import java.util.Arrays;
26 import java.util.HashMap;
27 import java.util.HashSet;
28 import java.util.Map;
29 import java.util.TreeMap;
30
31 /**
32 * A map from registers to frame slots. This can be used to describe where callee saved registers
33 * are saved in a callee's frame.
34 */
35 public final class RegisterSaveLayout {
36
37 /**
38 * Keys.
39 */
40 private final Register[] registers;
41
42 /**
43 * Slot indexes relative to stack pointer.
44 */
45 private final int[] slots;
46
47 /**
48 * Creates a map from registers to frame slots.
49 *
50 * @param registers the keys in the map
51 * @param slots frame slot index for each register in {@code registers}
52 */
53 public RegisterSaveLayout(Register[] registers, int[] slots) {
54 assert registers.length == slots.length;
55 this.registers = registers;
56 this.slots = slots;
57 assert registersToSlots(false).size() == registers.length : "non-unique registers";
58 assert new HashSet<>(registersToSlots(false).values()).size() == slots.length : "non-unqiue slots";
59 }
60
61 /**
62 * Gets the frame slot index for a given register.
63 *
64 * @param register register to get the frame slot index for
65 * @return frame slot index
66 */
67 public int registerToSlot(Register register) {
68 for (int i = 0; i < registers.length; i++) {
69 if (register.equals(registers[i])) {
70 return slots[i];
71 }
72 }
73 throw new IllegalArgumentException(register + " not saved by this layout: " + this);
74 }
75
76 /**
77 * Gets this layout information as a {@link Map} from registers to slots.
78 */
79 public Map<Register, Integer> registersToSlots(boolean sorted) {
80 Map<Register, Integer> result;
81 if (sorted) {
82 result = new TreeMap<>();
83 } else {
84 result = new HashMap<>();
85 }
86 for (int i = 0; i < registers.length; i++) {
87 result.put(registers[i], slots[i]);
88 }
89 return result;
90 }
91
92 /**
93 * Gets this layout information as a {@link Map} from slots to registers.
94 */
95 public Map<Integer, Register> slotsToRegisters(boolean sorted) {
96 Map<Integer, Register> result;
97 if (sorted) {
98 result = new TreeMap<>();
99 } else {
100 result = new HashMap<>();
101 }
102 for (int i = 0; i < registers.length; i++) {
103 result.put(slots[i], registers[i]);
104 }
105 return result;
106 }
107
108 @Override
109 public int hashCode() {
110 throw new UnsupportedOperationException();
111 }
112
113 @Override
114 public boolean equals(Object obj) {
115 if (this == obj) {
116 return true;
117 }
118 if (obj instanceof RegisterSaveLayout) {
119 RegisterSaveLayout that = (RegisterSaveLayout) obj;
120 if (Arrays.equals(registers, that.registers) && Arrays.equals(slots, that.slots)) {
121 return true;
122 }
123 }
124 return false;
125 }
126
127 @Override
128 public String toString() {
129 return registersToSlots(true).toString();
130 }
131 }